Hot water heater



Aug. 18, 1936.

R.E.MOORE HOT WATER HEATER Filed Jan. 4, 1935 fl 6 n n MAE! l:l %.j 6 Iv 15 i 24 j%, 41 :7; I 7/ I W J6 6 Ewen/$04" wags?) OZ'(2 "ZZd96/b77Z0O/"6 Patented Aug. 18, 1936 UNITED STATES HOT WATER HEATER RobertEdwin Moore, Chicago, Ill., assignor to Bell & Gossett Company, Chicago,Ill., a corporation of Illinois Application January 4, 1935, Serial No.394

2 Claims.

My present invention relates to the provision of a non-liming hot waterheater with temperature control and, as the above designation implies,has for its object, first, the provision of a hot water heater in whichwater containing salt of calcium in solution may be heated withoutcausing a deposition of lime upon the heater, and, second, the provisionof a heater in which the maximum temperature to which the water can beheated is controlled or regulated.

I have accomplished these objects by means of the structure illustratedin the accompanying drawing, in which- Fig. 1 is a schematic View of aboiler and a hot water storage tank with a water heater embodying myinvention assembled with and forming the connection between the boilerand the tank.

Fig. 2 is a central vertical elevation through the heater casing.

Fig. 3 is a fragmental detail, partially in section, of the meansemployed for adjusting the apparatus to secure the desired maximumheating temperature.

Similar reference characters refer to similar parts throughout therespective views.

The water heater or heat transfer device consists of a cylindricalcasing 5 having, preferably, a semi-spherical bottom 6, the center Iwhereof is tapped and threaded for receiving the piping constituting thereturn 8 to the boiler. The top of the casing 5 is a removable closureplate 9 held to the casing by machine bolts ID, or other suitable means.Installed within the casing 5 is a coil I I, preferably of copperbecause of its heat conducting properties, which coil II is connectedthrough ports l2 in the casing by means of tubes l3 with the hot waterstorage tank M. The form and arrangement of the casing 5, coil H andconnection between the coil II and the hot water storage tank 14 are inaccordance with present standard practice.

Instead, however, of connecting the casing 5 through ports l5 and I6directly with the boiler I! I connect the ports 15 and IS with thetubular ends l8 and 19 of a fitting comprising such tubular endsconnected by a tubular body portion 20. The tubular body portion 20 isextended beyond the tubular end l9 and the end of such extension isclosed by a clean-out plug 2|.

Mounted and secured at the lower end of the tubular body portion 20 is abi-metallic thermosensitive strip of metal 22. The strip of metal 22passes through the bore in the member 20 beyond the central line or axisof the tubular end [8 and adjacent the end thereof is provided with avalve 23 which co-operates with the valve seat 24 located in the tubularend portion l8. Connecting with the outer end of tubular portion I8 is apipe 25 which leads to the boiler l1 5 at a point adjacent but below thewater line' thereof. About the middle of the tubular body portion 20 isprovided a bore 26 in which is slidably mounted the stud of a bridlemember 21 through which the bi-metallic strip 22 passes. A 10 screw 28and a lock nut 29 are provided by means of which the position of thebridle 21 may be adjusted which will control the temperature at whichthe bi-metallic strip 22 will raise the valve 23 from its seat 24. Theboiler water is caused to circulate through the casing 5 by gravityinasmuch as when the water condenses by contact with the coil H andbecomes heavier and falls it will be returned to the bottom of theboiler l1 and hot water will flow into the casing 5 through the pipe 25.

The bridle 21 is adjusted so that when the boiler water flowing into thecasing 5 has attained the hottest desired temperature the bimetallicstrip will fiex so as to seat the valve 23 upon its seat 24, but whenthe temperature of water in the casing 5 is below the hottest desiredtemperature the bi-metallic strip 22' will be flexed in the oppositedirection so as to raise the valve 23 from its seat 24 and permit thehot boiler 30 water to enter the casing 5.

Much, if not all, of water available for service distribution is what isknown as hard and one reason for the hardness in water is that the watercontains carbon dioxide gas in solution and water with carbon dioxidegas in solution is capable of dissolving calcium carbonate. When thewater is heated the carbon dioxide gas is driven off and the calciumcarbonate is deposited.

It is found, however, that if the water is not. heated above or F. thecarbon dioxide gas will not be driven off andthe calcium carbonate willnot be deposited.

The water to be heated passing through the coil H can never be raised tothe temperature of the boiler water circulating about the coil H in thecasing 5, but the water to be heated will raise to about 10 to 15 of thetemperature of the boiler water so that if the bi-metallic strip is setto open the valve 23 at say or F. the water in the coil II will never'beheated to a point where the lime will be deposited. Moreover, servicewater heated above 135 or 140 F. is liable to start the joints and thepacking in the hot water distribution system and is dangerous, or liableto 7 be dangerous, to the person using the'water.

' While a 'hot water heater of this kind is not an excessive absorber ofthe heat from the boiler waterit, nevertheless, absorbs some of the heatj and my present invention limits-such absorption 7 strictly to theamount necessary to bring the service water supply to the temperaturerequired. By making the bi-metallic strip 22 substantially as' long asthe coil H it is responsive to'and actuated by the temperature of all ofthe water which is acting upon the coil H and not merely the hottestportion thereof located adjacent the valve 23. r a 7 Having described myinvention what -I claim is new and desire to secure by Letters Patentis:

1. In combination witha hot water heater comprising acasing adapted tobe connected to 'a boiler for securing acirculation of boiler. watertherethrough and having a heat transfer coil adaptedto be connected witha service water supply installed within said casing, a fitting havingtransverse end channels therein adapted respectively to beincluded intheconduit from the cas ing to the boiler and to the casing at a pointadjacent'the bottom thereof, and'a connecting means with a channelestablishing communica:

tion between'said end channels in which communicating channel is mounteda bi -metallic element, and a valve carried by said bi-Vmetallicielement cooperating with a valve seat for controlling the passagewayfrom the boiler to the casing.

2. In combination with a hot water eat r com- 7 prising a casing adaptedto be connected to: a

V boiler for securing a circulation of boiler water therethrough andhaving a heat transfer .coil adapted to be connected with a servicewater sup- 7 ply installed within said casing; a fitting havingco-operating with a valve seat for controlling the passageway from theboiler to the casing, and

means for adjustably modifying the flexing of saidbi-metallic element. 7

ROBERT EDWIN MOORE.

